[jQuery] jQuery Ajax breaking in IE..... please help!!

[jQuery] jQuery Ajax breaking in IE..... please help!!


I am developing a VoIP Customer Portal with jQuery/Ajax.
Everything works fine in Firefox, but in IE and Safari, the JS breaks.
I used MS Script Debugger to get a backtrace, and i find that the
breakpoint is at a jQuery Ajax call:
var AJAXURL = 'app/ajax.php';
$.ajax({
                 url:AJAXURL+"auth-login",
                 type:"POST",
                 data:"user="+uname+"&pass="+pass,
                 dataType:"json",
                 success:function( json ) {
// code removed
                 }
                 });
Why oh why is this happening??
Any help would be greatly appeciated.